About The Non-Genuine Parts
After replacing the screen with a non-genuine part you will see a pop-up alert "Unable to verify this iPhone has a genuine Apple display" notification will be displayed on the Lock screen for the first four days and it will stay in the Settings > General > About >Parts and service history
Display Messages alert don't affect your ability to use your iPhone.
About The Genuine Parts
iPhone displays have been designed, tested, and manufactured for Apple's quality and performance standards. This includes great color accuracy, white balance, and performance for features like True Tone, Night Shift, and Haptic Touch